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Controlling a wind turbine during a low voltage grid event using MPC

a technology of low voltage grid and wind turbine, applied in adaptive control, program control, instruments, etc., can solve the problems of hard limit to the time allowed for recovery, generator torque reduction, and generator speed increase almost immediately

Active Publication Date: 2021-09-21
VESTAS WIND SYST AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables rapid resumption of normal operation post-low voltage event while minimizing load exposure, effectively meeting grid code requirements and optimizing recovery time and load handling.

Problems solved by technology

When a wind turbine experiences a low voltage event as a result of a fault of the utility grid, the torque on the generator is diminished and the generator speed increases almost immediately as a result of the excessive aerodynamic power that cannot be converted to electrical power.
In general there is a desire to bring the turbine back to normal operation as fast as possible, and in some grid codes there may even be set a hard limit to the time allowed for recovery.
However, the speed at which the turbine can resume normal operation after a low voltage event is limited by load exposure of the tower, drive train, etc.

Method used

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  • Controlling a wind turbine during a low voltage grid event using MPC
  • Controlling a wind turbine during a low voltage grid event using MPC
  • Controlling a wind turbine during a low voltage grid event using MPC

Examples

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Embodiment Construction

[0027]FIG. 1 illustrates, in a schematic perspective view, an example of a wind turbine 1. The wind turbine 1 includes a tower 2, a nacelle 3 disposed at the apex of the tower, and a rotor 4 operatively coupled to a generator housed inside the nacelle 3. In addition to the generator, the nacelle houses miscellaneous components required for converting wind energy into electrical energy and various components needed to operate, control, and optimize the performance of the wind turbine 1. The rotor 4 of wind turbine includes a central hub 5 and a plurality of blades 6 that project outwardly from the central hub 5. In the illustrated embodiment, the rotor 4 includes three blades 6, but the number may vary. Moreover, the wind turbine comprises a control system. The control system may be placed inside the nacelle or distributed at a number of locations inside (or externally to) the turbine and communicatively connected.

[0028]The wind turbine 1 may be included among a collection of other w...

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PUM

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Abstract

A wind turbine system comprising a nacelle mounted on a tower, a rotor having a plurality of blades and a boundary layer control system configured to control airflow through blade surface openings in each of the blades. The wind turbine system includes a control system configured to: monitor an operational speed parameter of the wind turbine, and activate the boundary layer control system if it is determined that the operational speed parameter exceeds a predetermined speed parameter threshold; monitor tower motion and to activate the boundary layer control system based on a determination of excessive tower motion; monitor for a wind turbine shutdown condition, activate the boundary layer control system if it is determined that the shutdown condition has been identified; monitor the aerodynamic loads on the blades, and activate the boundary layer control system based on a determination of excessive blade loads.

Description

FIELD OF THE INVENTION[0001]The invention relates to control of a wind turbine in connection with a detected low voltage grid event where the grid voltage drop from a first level and to a second lower level.BACKGROUND OF THE INVENTION[0002]Utility grid companies set out the strategies and requirements for the connection of wind turbines to the utility grid. These connection requirements are described in so-called grid codes. The grid codes vary depending upon the geographical location of the utility grid.[0003]One of the topics discussed in grid codes is the capabilities of a wind turbine when the utility grid experiences a fault, such as a low voltage event where the grid voltage drop from a first level and to a second lower level. One requirement may be that the wind turbine stay connected and synchronized to the utility grid during the grid fault, at least for some types of faults.[0004]When a wind turbine experiences a low voltage event as a result of a fault of the utility grid...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F03D7/02F03D7/04F03D9/25
CPCF03D7/0284F03D7/045F03D9/255F05B2270/1033F05B2270/1071F05B2270/332F05B2270/337F05B2270/404G05B13/048G05B2219/2619F03D7/0224F05B2270/10711Y02B10/30Y02E10/72
Inventor KJÆR, MARTIN ANSBJERGHOVGAARD, TOBIAS GYBEL
Owner VESTAS WIND SYST AS